Backlight driving channel short circuit detection method, device, system, equipment and medium

Abstract

The application is suitable for the technical field of display, and particularly relates to a backlight driving channel short circuit detection method, device, system, equipment and medium. The method is applied to a controller of a display system, the display system comprises a driver and a power supply, the driver is provided with a driving channel, the driving channel is connected to the power supply through a series of lamp beads, and the method comprises the following steps: controlling the power supply to output a first power supply voltage, so that all the driving channels are under-voltage, sending a first driving channel switch instruction to the driver, so that one of two adjacent driving channels in the driver is turned on, and the other driving channel is turned off, receiving first under-voltage state information fed back by the driver, and for any first under-voltage state information, if the first under-voltage state information is not under-voltage, it is determined that the adjacent driving channel corresponding to the first under-voltage state information has a short circuit. The short circuit fault between the driving channels is detected without increasing the cost of additional hardware.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a method, apparatus, system, device and medium for detecting short circuits in a backlight driving channel. Background Technology

[0002] With the continuous development of display technology, Mini LED backlighting technology, with its significant advantages such as high brightness, high contrast, and high local dimming precision, is being widely used in high-end LCD monitors, televisions, laptops, and other display devices, becoming an important development direction for next-generation display technology. Mini LED backlight modules typically employ an active matrix driving architecture, using dedicated LED driver ICs to independently or in groups control a large number of Mini LED chips. Each driver IC can drive several, dozens, or even hundreds of independent LED channels, with each channel responsible for driving one or a group of Mini LED chips. To achieve precise local dimming, the number of driving channels continues to increase, and the integration of the driving circuitry becomes increasingly sophisticated.

[0003] However, during the manufacturing, transportation, or long-term use of Mini LED backlight modules, short circuits may occur between adjacent LED driver channels due to process defects, external damage, or aging. Such short circuits cause abnormal current to flow through the faulty channel and surrounding circuitry, resulting in uneven brightness, dark or bright spots in the display area, affecting the display effect. In severe cases, it can damage the driver IC due to overcurrent, or even cause circuit burnout and other safety hazards, significantly reducing the reliability and lifespan of the display device.

[0004] Currently, two common short-circuit fault detection schemes are used in existing technologies: the driver IC-integrated hardware detection scheme and the external device-assisted detection scheme. For the driver IC-integrated hardware detection scheme: Some high-end LED driver ICs integrate short-circuit detection circuits within the chip. For example, a comparator monitors the output voltage or current of each channel, triggering a protection mechanism when an anomaly is detected. However, this scheme requires additional hardware circuitry during the chip design phase, which not only increases the design complexity and production cost of the driver IC but also increases the chip's power consumption. For the low-to-mid-range market or cost-sensitive applications, this scheme is less economical. For the external device-assisted detection scheme: Dedicated external testing equipment, such as precision impedance testers, infrared thermal imagers, or industrial cameras, is used for offline testing of the backlight module during production testing or equipment maintenance. However, while this type of scheme offers high detection accuracy, it requires additional equipment investment, the testing process is complex and time-consuming, and online self-testing cannot be performed during normal equipment operation, increasing the overall production and maintenance costs.

[0005] Therefore, how to detect short-circuit faults between drive channels without increasing hardware costs has become an urgent problem to be solved. Summary of the Invention

[0006] In view of this, embodiments of this application provide a method, apparatus, system, device and medium for detecting short circuits in backlight driving channels, in order to solve the problem of how to detect short circuit faults between driving channels without increasing additional hardware costs.

[0007] In a first aspect, embodiments of this application provide a backlight driving channel short-circuit detection method. The backlight driving channel short-circuit detection method is applied to a controller of a display system. The display system further includes at least one driver and at least one power supply connected to the controller. The driver is provided with at least two driving channels, each driving channel being connected to the power supply via n LEDs connected in series, where n is a positive integer. The method includes: The power supply is controlled to output a first supply voltage. The voltage of the first supply voltage after being divided by the lamp beads of any driving channel is less than the undervoltage reference voltage of the corresponding driving channel, so that all driving channels are undervoltage. Send a first drive channel switch command to the driver so that one of two adjacent drive channels in the driver is turned on and the other drive channel is turned off; The driver receives first undervoltage status information fed back by the driver, wherein the driver is used to collect the first undervoltage status information of each activated drive channel after executing the first drive channel switching command, and feed it back to the controller. For any first undervoltage state information, if the first undervoltage state information is not undervoltage, then it is determined that the adjacent drive channel corresponding to the first undervoltage state information has a short circuit.

[0008] Secondly, embodiments of this application provide a backlight driving channel short-circuit detection device. This device is applied to a controller of a display system. The display system further includes at least one driver and at least one power supply connected to the controller. The driver has at least two driving channels, each connected to the power supply via n LEDs connected in series, where n is a positive integer. The first power control module is used to control the power supply to output a first power supply voltage. The voltage of the first power supply voltage after being divided by the lamp beads of any driving channel is less than the undervoltage reference voltage of the corresponding driving channel, so that all driving channels are undervoltage. The first driver control module is used to send a first drive channel switching command to the driver, so that one drive channel in two adjacent drive channels in the driver is turned on and the other drive channel is turned off. The first feedback receiving module is used to receive the first undervoltage state information of each drive channel fed back by the driver, wherein the driver is used to collect the first undervoltage state information of each drive channel that is turned on after executing the first drive channel switching command, and feed it back to the controller. The first short-circuit detection module is used to determine that a short circuit has occurred in the adjacent drive channel corresponding to any first undervoltage state information if the first undervoltage state information is not undervoltage.

[0009] Thirdly, embodiments of this application provide a display system, the display system comprising: A controller, at least one driver connected to the controller, and at least one power supply; The driver is provided with at least two driving channels, and each driving channel is connected to the power supply through n LEDs connected in series, where n is an integer greater than zero; The controller is used to perform the backlight drive channel short-circuit detection method described in the first aspect above.

[0010] Fourthly, embodiments of this application provide an electronic device, the electronic device including a processor, a memory, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the backlight driving channel short-circuit detection method as described in the first aspect above.

[0011] Fifthly, embodiments of this application provide a computer-readable storage medium storing a computer program that, when executed by a processor, implements the backlight driving channel short-circuit detection method as described in the first aspect above.

[0012] The beneficial effects of this application embodiment compared with the prior art are as follows: The backlight driving channel short circuit detection method of this application is applied to the controller of a display system. The display system also includes at least one driver and at least one power supply connected to the controller. The driver is provided with at least two driving channels. Each driving channel is connected to the power supply through n LEDs connected in series. The power supply is controlled to output a first supply voltage. The voltage of the first supply voltage after being divided by the LEDs of any driving channel is less than the undervoltage reference voltage of the corresponding driving channel, so that all driving channels are undervoltage. A first driving channel switching command is sent to the driver so that one of the two adjacent driving channels in the driver is turned on and the other driving channel is turned off. The driver receives the first undervoltage state information fed back by the driver. The driver is used to collect the first undervoltage state information of each driving channel that is turned on after executing the first driving channel switching command and feeds it back to the controller. For any first undervoltage state information, if the first undervoltage state information is not undervoltage, it is determined that the adjacent driving channel corresponding to the first undervoltage state information has a short circuit.

[0013] In this method, when all channels are in an undervoltage state, one of two adjacent channels is turned on and the other is turned off. Due to the constant current characteristic of the driver, the total output current of the turned-on channel will be stably maintained at the set value by the driver. If a short circuit fault exists between adjacent channels, the LEDs on the channel will form a parallel structure through the short circuit point. The total output current of the turned-on channel will be shunted by the parallel LED branch. The operating current of each LED will be reduced compared to the current (total output current) when it is working normally (i.e., when only one branch is conducting). According to the volt-ampere characteristic of the LED, its forward voltage will decrease accordingly. With the supply voltage remaining unchanged, the decrease in the forward voltage drop of the LED will cause the port voltage of the turned-on drive channel to increase accordingly, thereby changing the channel from an undervoltage state to a non-undervoltage state. Therefore, through this specific control strategy, the detection of short circuit faults between channels can be achieved simply by changing the state of the channel port voltage, without adding additional hardware detection costs. This achieves low-cost and high-reliability short circuit fault detection, effectively reducing the hardware cost and implementation complexity of short circuit fault detection. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of a display system provided in this application; Figure 2This is a flowchart illustrating a short-circuit detection method for a backlight driving channel provided in Embodiment 2 of this application; Figure 3 This is a schematic diagram of switching a drive channel in a driver according to a first drive channel switching command, provided in Embodiment 2 of this application; Figure 4 This is a schematic diagram of switching a drive channel in a driver according to a second drive channel switching command, provided in Embodiment 2 of this application. Figure 5 This is a schematic diagram of the structure of a backlight driving channel short-circuit detection device provided in Embodiment 3 of this application; Figure 6 This is a schematic diagram of the structure of an electronic device provided in Embodiment 4 of this application. Detailed Implementation

[0016] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0017] It should be understood that, when used in this application specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or a collection thereof.

[0018] It should also be understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0019] As used in this application specification and the appended claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if detected [the described condition or event]" may be interpreted, depending on the context, as meaning "once determined," "in response to determination," "once detected [the described condition or event]," or "in response to detection [the described condition or event]."

[0020] Furthermore, in the description of this application and the appended claims, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0021] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0022] It should be understood that the sequence number of each step in the following embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0023] To illustrate the technical solution of this application, specific embodiments are described below.

[0024] like Figure 1 The diagram shown is a schematic diagram of a display system provided in Embodiment 1 of this application. The display system includes a controller, at least one driver connected to the controller, and at least one power supply. The driver is provided with at least two driving channels. Each driving channel is connected to the power supply through n LEDs connected in series, where n is an integer greater than zero. The controller is used to execute the following backlight driving channel short circuit detection method.

[0025] like Figure 1As shown, the controller of this display system can be a backlight controller (BCON), or it can be replaced by a microcontroller unit (MCU), system on chip (SOC), field programmable gate array (FPGA), or other host devices. Taking the backlight controller as an example, the display system includes N drive chains (e.g., the link between SCLK1, MISO1 and DOS1, ..., and the link between SCLKN, MISON and DOSN, i.e., N links, where the diagram only shows the first link (i.e., the link between SCLK1, MISO1 and DOS1) and the Nth link (i.e., the link between SCLKN, MISON and DOSN). The N-2 links between the first link and the Nth link are not shown in the diagram. It also includes one power supply DC-DC converter. The output voltage of this power supply is controlled by the backlight controller through the FB pin. Each drive chain has a series connection. The system includes M drivers (e.g., drivers ID-1-1, ID-1-2, ..., ID-1-M connected in series on the link between SCLK1, MISO1, and DOS1; the diagram only shows the first driver (ID-1-1), the second driver (ID-1-2), and the Mth driver (ID-1-M). The M-3 drivers between the second and Mth drivers are not shown in the diagram). These drivers can be constant current drivers, each with 8 drive channels (e.g., driver ID-1-1 has CH1, CH2, CH3, CH4, CH5, CH6, CH7, and CH8). Each drive channel is connected to the power supply via n LEDs connected in series. The display system also includes a front-end SOC connected to the backlight controller via a Serial Peripheral Interface (SPI).

[0026] The main functions of this backlight controller in implementing the following backlight drive channel short-circuit detection method are: controlling the output voltage of the power supply according to the current requirement of the drive channel; controlling the brightness of the drive channel in the driver according to the instructions sent by the front-end SOC via SPI; and monitoring the working status of the driver.

[0027] like Figure 2 The diagram shown is a flowchart illustrating a short-circuit detection method for a backlight driving channel according to Embodiment 2 of this application. This embodiment uses a controller applied to a display system as an example, and the short-circuit detection method for the backlight driving channel may include the following steps: Step S201: Control the power supply to output a first power supply voltage. The voltage of the first power supply voltage after being divided by the lamp beads of any driving channel is less than the undervoltage reference voltage of the corresponding driving channel, so that all driving channels are undervoltage.

[0028] The first supply voltage can refer to the voltage output by the power supply that makes all drive channels under-voltage. The under-voltage reference voltage can refer to the reference voltage set for each drive channel to determine under-voltage. That is, when the port voltage of the drive channel is lower than its corresponding under-voltage reference voltage, the drive channel is in an under-voltage state.

[0029] Specifically, the power supply outputs a first supply voltage, such that after the first supply voltage is divided by the LED beads connected in series in any driving channel, the port voltage of each driving channel is less than the undervoltage reference voltage of the corresponding driving channel, so that all driving channels just enter the undervoltage state.

[0030] Optionally, before controlling the power supply to output the first supply voltage, the method further includes: Obtain the second supply voltage output by the power supply when all drive channels change from undervoltage to non-undervoltage; The first supply voltage is obtained by subtracting the preset voltage difference from the second supply voltage.

[0031] The second supply voltage can refer to the voltage output by the power supply that converts all drive channels from undervoltage to non-undervoltage. The preset voltage difference must at least satisfy the obtained first supply voltage. When powering on, the voltage after voltage division by the lamp beads of any drive channel is less than the undervoltage reference voltage of the corresponding drive channel.

[0032] That is, the output voltage of the power supply can be gradually increased until the port voltage of all drive channels is greater than or equal to the undervoltage reference voltage of the corresponding drive channel to obtain the second power supply voltage. The power supply can then be reduced based on the second power supply voltage until the first power supply voltage is reached, so that the port voltage of all drive channels is less than the undervoltage reference voltage of the corresponding drive channel, thus making all drive channels undervoltage.

[0033] Optionally, obtaining the second supply voltage output by the power supply when all drive channels change from undervoltage to non-undervoltage includes: Starting when the supply voltage of the power supply is lower than the preset voltage value, a command to increase the supply voltage is sent to the power supply. Receive the third undervoltage status information fed back by the driver; If undervoltage is present in all the third undervoltage status information, then return to execute the command to send an increase in supply voltage to the power supply until there is no undervoltage in all the third undervoltage status information, and record the supply voltage output by the power supply at this time as the second supply voltage.

[0034] The preset voltage value can refer to a pre-set voltage value that causes undervoltage in the drive channel, and the third undervoltage status information can refer to the information received after sending a command to increase the power supply voltage, reflecting whether the drive channel is undervoltage.

[0035] That is, starting from the point where the supply voltage of the power supply is less than the preset voltage value, an instruction to increase the supply voltage is sent to the power supply. The driver collects the third undervoltage status information of all drive channels in real time and feeds it back to the controller. The controller receives the third undervoltage status information fed back by the driver. If there is undervoltage in all the third undervoltage status information, it returns to execute the instruction to send an increase in the supply voltage to the power supply to continue to increase the supply voltage until there is no undervoltage in all the third undervoltage status information fed back by the driver received by the controller. The supply voltage output by the power supply at this time is recorded as the second supply voltage.

[0036] Optionally, before subtracting a preset voltage difference from the second supply voltage to obtain the first supply voltage, the method further includes: Starting with the power supply voltage as the second power supply voltage, a command to reduce the power supply voltage is sent to the power supply. Receive the fourth undervoltage status information fed back by the driver; If any of the fourth undervoltage status messages are not undervoltage, then return to execute the command to reduce the supply voltage to the power supply until all the fourth undervoltage status messages are undervoltage. Record the voltage difference from the second supply voltage reduction to the point when all the fourth undervoltage status messages are undervoltage as the preset voltage difference.

[0037] The fourth undervoltage status information can refer to the information received after sending a command to reduce the power supply voltage, reflecting whether the drive channel is undervoltage.

[0038] That is, starting from the second supply voltage of the power supply, a command to reduce the supply voltage is sent to the power supply to reduce the supply voltage. The driver collects the fourth undervoltage status information of all drive channels in real time and feeds it back to the controller. The controller receives the fourth undervoltage status information fed back by the driver. If there is no undervoltage among all the fourth undervoltage status information, it returns to execute the command to send the supply voltage to reduce the supply voltage to continue to reduce the supply voltage until all the fourth undervoltage status information fed back by the driver received by the controller is undervoltage. The voltage difference from the second supply voltage to the point when all the fourth undervoltage status information is undervoltage is recorded as the preset voltage difference.

[0039] Step S202: Send a first drive channel switch command to the driver so that one of two adjacent drive channels in the driver is turned on and the other drive channel is turned off.

[0040] Step S203: Receive the first undervoltage status information fed back by the driver.

[0041] The first drive channel switch command can be a control command that turns on one of two adjacent drive channels in the driver and turns off the other. The first undervoltage status information can be information received after sending the first drive switch command that reflects whether the drive channel is undervoltage.

[0042] Specifically, a first drive channel switch command is sent to the driver, causing one of two adjacent drive channels in the driver to turn on and the other to turn off. For example, if the driver has four drive channels, CH1, CH2, CH3, and CH4, after sending the first drive channel switch command, the drive channels that are turned on in the driver can be CH1 and CH3, and the drive channels that are turned off can be CH2 and CH4; or, the drive channels that are turned on in the driver can be CH2 and CH4, and the drive channels that are turned off can be CH1 and CH3. The driver collects the first undervoltage status information (i.e., undervoltage or no undervoltage) of each turned-on drive channel after executing the first drive channel switch command, and feeds the first undervoltage status information back to the controller. The controller receives the first undervoltage status information of the turned-on drive channels fed back by the driver.

[0043] Step S204: For any first undervoltage state information, if the first undervoltage state information is not undervoltage, then it is determined that the adjacent drive channel corresponding to the first undervoltage state information has a short circuit.

[0044] Specifically, if all first undervoltage status messages are undervoltage, then the driver's drive channel is not short-circuited. For any received first undervoltage status message of an active drive channel, if the first undervoltage status message is not undervoltage, it indicates that the active drive channel is short-circuited with an adjacent drive channel. This is because, due to the driver's constant current characteristic, the total output current of the active drive channel will be stably maintained at a set value by the driver. If a short-circuit fault exists between the active drive channel and an adjacent channel, the LEDs on that channel will form a parallel structure through the short-circuit point. The total output current of the channel will be shunted by the parallel LED branches. The operating current of each LED will be reduced compared to the current during normal operation. According to the volt-ampere characteristics of the LED, its forward voltage will decrease accordingly. With the supply voltage remaining constant, the decrease in the forward voltage drop of the LED will cause the port voltage of the activated drive channel to increase accordingly, thereby causing the activated drive channel to change from an undervoltage state to a non-undervoltage state. Based on the increase in the port voltage of the activated drive channel and the change from undervoltage to non-undervoltage state, it can be determined that a short circuit fault has occurred between the activated drive channel and its adjacent drive channel.

[0045] For example, such as Figure 3The diagram shown is a schematic of switching a drive channel in a driver according to a first drive channel switching command, provided in Embodiment 2 of this application. Vdcdc is the output voltage of the power supply, Driver is the driver, VCH1 is the voltage applied to drive channel CH1 after the power supply output voltage is divided by the LED beads, VCH2 is the voltage applied to drive channel CH2 after the power supply output voltage is divided by the LED beads, VCH3 is the voltage applied to drive channel CH3 after the power supply output voltage is divided by the LED beads, and VCH4 is the voltage applied to drive channel CH4 after the power supply output voltage is divided by the LED beads.

[0046] like Figure 3 After sending the first drive channel switch command to the driver, the drive channels that are turned on in the driver are CH2 and CH4, and the drive channels that are turned off are CH1 and CH3. If CH2 changes from undervoltage to not undervoltage, and CH4 is still undervoltage, it can be determined that CH2 is short-circuited with the adjacent drive channel. For CH2, there are three situations in which it is short-circuited with the adjacent drive channel: short circuit between CH1 and CH2 (the LEDs connected in series on CH1 and CH2 form a parallel structure through the short circuit point), short circuit between CH2 and CH3 (the LEDs connected in series on CH2 and CH3 form a parallel structure through the short circuit point), and short circuit between CH1, CH2 and CH3 (the LEDs connected in series on CH1, CH2 and CH3 form a parallel structure through the short circuit point).

[0047] To further determine which adjacent drive channel the short-circuit fault occurred with specifically the activated drive channel (e.g., CH2), optionally, after receiving the first undervoltage status information from the driver, the following steps are also included: Send a second drive channel switch command to the driver; Receive the second undervoltage status information fed back by the driver; For any second undervoltage state information, if the second undervoltage state information is not undervoltage, then it is determined that the adjacent drive channel corresponding to the second undervoltage state information has a short circuit. For any pair of adjacent drive channels, if both adjacent drive channels are short-circuited, then the adjacent drive channels are identified as short-circuited.

[0048] The second drive channel switch command can be obtained by swapping the drive channel that is turned on and the drive channel that is turned off in the first drive channel switch command. The second undervoltage status information can be the information received after sending the second drive switch command, reflecting whether the drive channel is undervoltage.

[0049] That is, a second drive switch command is sent to the driver to turn off the drive channels that were turned on according to the first drive switch command, and turn on the drive channels that were turned off according to the first drive switch command. For example, if the drive channels that were turned on according to the first drive switch command are CH2 and CH4, and the drive channels that were turned off are CH1 and CH3, then after swapping the switches of adjacent drive channels according to the second drive switch command, the drive channels that were turned on are CH1 and CH3, and the drive channels that were turned off are CH2 and CH4. The driver collects the second undervoltage status information of each turned-on drive channel after executing the second drive channel switch command, that is, undervoltage or no undervoltage, and feeds the second undervoltage status information back to the controller. The controller receives the second undervoltage status information of the turned-on drive channels fed back by the driver. For any turned-on drive channel, if the second undervoltage status information is no undervoltage, it means that the turned-on drive channel is short-circuited with the adjacent drive channel. If the turned-on drive channel and the adjacent drive channels are all short-circuited, then the adjacent drive channels are located as short-circuited.

[0050] For example, such as Figure 4 The diagram shown is a schematic of a method for switching a drive channel in a driver according to a second drive channel switching command, as provided in Embodiment 2 of this application.

[0051] After sending the first drive switch command to the driver, the drive channels CH2 and CH4 are enabled, and the drive channels CH1 and CH3 are disabled. It is determined that CH2 is short-circuited with an adjacent drive channel. There are three possible scenarios for this short-circuit fault: short circuit between CH1 and CH2, short circuit between CH2 and CH3, and short circuit between CH1, CH2, and CH3. Figure 4 After sending the second drive switch command to the driver, the drive channels CH1 and CH3 are turned on, and the drive channels CH2 and CH4 are turned off. If CH1 is still undervoltage, and CH3 changes from undervoltage to no undervoltage, then it can be determined that CH2 and CH3 are short-circuited. If CH1 changes from undervoltage to no undervoltage, and CH3 is still undervoltage, then it can be determined that CH1 and CH2 are short-circuited (e.g., Figure 3 and Figure 4 If both CH1 and CH3 change from undervoltage to non-undervoltage, then it can be determined that CH1, CH2 and CH3 are shorted.

[0052] In this embodiment, by controlling one of two adjacent channels to be turned on and the other to be turned off when all channels are in an undervoltage state, the total output current of the turned-on channel will be stably maintained at a set value by the driver due to the constant current characteristics of the driver. If there is a short circuit fault between adjacent channels, the LEDs on the channel will form a parallel structure through the short circuit point. The total output current of the turned-on channel will be shunted by the parallel LED branch. The operating current of each LED will be reduced compared to the current (total output current) when it is working normally (i.e., when only one branch is conducting). According to the volt-ampere characteristics of the LED, its forward voltage will decrease accordingly. With the supply voltage remaining unchanged, the decrease in the forward voltage drop of the LED will cause the port voltage of the turned-on drive channel to increase accordingly, thereby changing the channel from an undervoltage state to a non-undervoltage state. Therefore, through this specific control strategy, the detection of short circuit faults between channels can be achieved simply by changing the state of the channel port voltage, without adding additional hardware detection costs. This achieves low-cost and high-reliability short circuit fault detection, effectively reducing the hardware cost and implementation complexity of short circuit fault detection.

[0053] like Figure 5 The diagram shown is a structural schematic of a backlight driving channel short-circuit detection device provided in Embodiment 3 of this application. This backlight driving channel short-circuit detection device 50 is applied to the controller of a display system. The display system also includes at least one driver and at least one power supply connected to the controller. The driver has at least two driving channels, each driving channel being connected to the power supply through n LEDs connected in series, where n is a positive integer. The short-circuit detection device includes: The first power control module 501 is used to control the power supply to output a first power supply voltage. The voltage of the first power supply voltage after being divided by the lamp beads of any driving channel is less than the undervoltage reference voltage of the corresponding driving channel, so that all driving channels are undervoltage. The first driver control module 502 is used to send a first drive channel switching command to the driver, so that one drive channel in two adjacent drive channels in the driver is turned on and the other drive channel is turned off. The first feedback receiving module 503 is used to receive the first undervoltage state information of each drive channel fed back by the driver, wherein the driver is used to collect the first undervoltage state information of each drive channel that is turned on after executing the first drive channel switching command, and feed it back to the controller. The first short-circuit detection module 504 is used to determine that a short circuit has occurred in the adjacent drive channel corresponding to any first undervoltage state information if the first undervoltage state information is not undervoltage.

[0054] Optionally, the backlight drive channel short-circuit detection device also includes: The second driver control module is used to send a second drive channel switching command to the driver. The second drive channel switching command is obtained by swapping the drive channel that is turned on and the drive channel that is turned off in the first drive channel switching command. The second feedback receiving module is used to receive the second undervoltage status information fed back by the driver, wherein the driver is used to collect the second undervoltage status information of each activated drive channel after executing the second drive channel switching command, and feed it back to the controller; The second short-circuit detection module is used to determine that a short circuit has occurred in the adjacent drive channel corresponding to any second undervoltage state information if the second undervoltage state information is not undervoltage. The short circuit detection module is used to locate the short circuit in any pair of adjacent drive channels if both adjacent drive channels are short-circuited.

[0055] Optionally, the backlight drive channel short-circuit detection device also includes: The acquisition module is used to acquire the second supply voltage output by the power supply when all drive channels change from undervoltage to non-undervoltage; The calculation module is used to subtract a preset voltage difference from the second power supply voltage to obtain a first power supply voltage. The preset voltage difference at least satisfies the requirement that the voltage after voltage division by the lamp beads in any driving channel is less than the undervoltage reference voltage of the corresponding driving channel when power is supplied.

[0056] Optionally, the above-mentioned acquisition module includes: The second power control unit is used to send an instruction to increase the power supply voltage to the power supply starting when the power supply voltage is less than a preset voltage value. The third feedback receiving unit is used to receive the third undervoltage status information fed back by the driver, wherein the driver collects the third undervoltage status information of all drive channels in real time and feeds it back to the controller. The first loop unit is used to return to the command to send an increase in supply voltage to the power supply if there is undervoltage in all the third undervoltage status information, until there is no undervoltage in all the third undervoltage status information, and record the supply voltage output by the power supply at this time as the second supply voltage.

[0057] Optionally, the backlight drive channel short-circuit detection device also includes: The third power control module is used to send a command to the power supply to reduce the power supply voltage, starting with the power supply voltage of the power supply as the second power supply voltage; The fourth feedback receiving module is used to receive the fourth undervoltage status information fed back by the driver, wherein the driver collects the fourth undervoltage status information of all drive channels in real time and feeds it back to the controller; The second loop module is used to return to the command to send a reduction in the supply voltage to the power supply if there is no undervoltage among all the fourth undervoltage status information, until all the fourth undervoltage status information is undervoltage, and record the voltage difference from the second supply voltage reduction to the point when all the fourth undervoltage status information is undervoltage as a preset voltage difference.

[0058] Optionally, the backlight drive channel short-circuit detection device also includes: The third short-circuit detection module is used to determine if the driver's drive channel is not short-circuited if all the first undervoltage status information is undervoltage.

[0059] It should be noted that the information interaction and execution process between the above modules are based on the same concept as the method embodiments of this application. For details on their specific functions and technical effects, please refer to the method embodiments section, which will not be repeated here.

[0060] like Figure 6 The diagram shown is a structural schematic of an electronic device provided in Embodiment 4 of this application. Please refer to it. Figure 6 The electronic device 60 includes a memory 601 and a processor 602. The memory 601 is used to store computer programs, and the processor 602 is used to execute the programs stored in the memory 601 to implement the backlight driving channel short circuit detection method described in any embodiment of this application.

[0061] This application also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the backlight drive channel short-circuit detection method described in any embodiment of this application.

[0062] In this application, "multiple" refers to two or more.

[0063] In this application, unless otherwise expressly defined, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0064] The terms “first,” “second,” “third,” “fourth,” etc., in this application (if any) are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0065] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0066] Unless otherwise specified, all steps in this application may be performed sequentially or randomly. For example, if the method includes steps A and B, it means that the method may include steps A and B performed sequentially, or it may include steps B and A performed sequentially. For example, if the method may also include step C, it means that step C may be added to the method in any order. For example, the method may include steps A, B, and C, or it may include steps A, C, and B, or it may include steps C, A, and B, etc.

[0067] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for detecting short circuits in a backlight driving channel, characterized in that, The backlight driving channel short-circuit detection method is applied to the controller of a display system. The display system further includes at least one driver and at least one power supply connected to the controller. The driver is provided with at least two driving channels, and each driving channel is connected to the power supply through n LEDs connected in series, where n is a positive integer. The power supply is controlled to output a first supply voltage. The voltage of the first supply voltage after being divided by the lamp beads of any driving channel is less than the undervoltage reference voltage of the corresponding driving channel, so that all driving channels are undervoltage. Send a first drive channel switch command to the driver so that one of two adjacent drive channels in the driver is turned on and the other drive channel is turned off; The driver receives first undervoltage status information fed back by the driver, wherein the driver is used to collect the first undervoltage status information of each activated drive channel after executing the first drive channel switching command, and feed it back to the controller. For any first undervoltage state information, if the first undervoltage state information is not undervoltage, then it is determined that the adjacent drive channel corresponding to the first undervoltage state information has a short circuit.

2. The backlight driving channel short-circuit detection method according to claim 1, characterized in that, After receiving the first undervoltage status information for each drive channel from the driver, the method further includes: Send a second drive channel switching command to the driver. The second drive channel switching command is obtained by swapping the drive channels that are turned on and the drive channels that are turned off in the first drive channel switching command. The driver receives second undervoltage status information from the driver, wherein the driver is used to collect second undervoltage status information of each activated drive channel after executing the second drive channel switching command, and feeds it back to the controller; For any second undervoltage state information, if the second undervoltage state information is not undervoltage, then it is determined that the adjacent drive channel corresponding to the second undervoltage state information has a short circuit. For any pair of adjacent drive channels, if both adjacent drive channels are short-circuited, then the adjacent drive channels are identified as short-circuited.

3. The backlight driving channel short-circuit detection method according to claim 1 or 2, characterized in that, Before controlling the power supply to output the first power supply voltage, the method further includes: Obtain the second supply voltage output by the power supply when all drive channels change from undervoltage to non-undervoltage; The first supply voltage is obtained by subtracting the preset voltage difference from the second supply voltage. The preset voltage difference at least satisfies the first supply voltage obtained. When supplying power, the voltage after voltage division by the lamp beads in any driving channel is less than the undervoltage reference voltage of the corresponding driving channel.

4. The backlight driving channel short-circuit detection method according to claim 3, characterized in that, The acquisition of the second supply voltage output by the power supply when all drive channels change from undervoltage to non-undervoltage includes: Starting when the supply voltage of the power supply is less than a preset voltage value, an instruction to increase the supply voltage is sent to the power supply. The driver receives the third undervoltage status information fed back by the driver, wherein the driver collects the third undervoltage status information of all drive channels in real time and feeds it back to the controller; If undervoltage is present in all the third undervoltage status information, then return to execute the instruction to send an increase in supply voltage to the power supply until there is no undervoltage in all the third undervoltage status information, and record the supply voltage output by the power supply at this time as the second supply voltage.

5. The backlight driving channel short-circuit detection method according to claim 3, characterized in that, Before subtracting the preset voltage difference from the second supply voltage to obtain the first supply voltage, the method further includes: Starting with the power supply voltage of the power source as the second power supply voltage, a command to reduce the power supply voltage is sent to the power source. The driver receives the fourth undervoltage status information from the driver, wherein the driver collects the fourth undervoltage status information of all drive channels in real time and feeds it back to the controller. If any of the fourth undervoltage status information is not undervoltage, then return to the command to send a reduction in the supply voltage to the power supply until all the fourth undervoltage status information is undervoltage. Record the voltage difference from the second supply voltage reduction to the point when all the fourth undervoltage status information is undervoltage as the preset voltage difference.

6. The backlight driving channel short-circuit detection method according to claim 1, characterized in that, After receiving the first undervoltage status information for each drive channel from the driver, the method further includes: If all the first undervoltage status information is undervoltage, then the drive channel of the driver has not been short-circuited.

7. A short-circuit detection device for a backlight driving channel, characterized in that, The backlight driving channel short-circuit detection device is applied to the controller of the display system. The display system further includes at least one driver and at least one power supply connected to the controller. The driver is provided with at least two driving channels, and each driving channel is connected to the power supply through n LEDs connected in series, where n is an integer greater than zero. The first power control module is used to control the power supply to output a first power supply voltage. The voltage of the first power supply voltage after being divided by the lamp beads of any driving channel is less than the undervoltage reference voltage of the corresponding driving channel, so that all driving channels are undervoltage. The first driver control module is used to send a first drive channel switching command to the driver, so that one drive channel in two adjacent drive channels in the driver is turned on and the other drive channel is turned off. The first feedback receiving module is used to receive the first undervoltage state information of each drive channel fed back by the driver, wherein the driver is used to collect the first undervoltage state information of each drive channel that is turned on after executing the first drive channel switching command, and feed it back to the controller. The first short-circuit detection module is used to determine that a short circuit has occurred in the adjacent drive channel corresponding to any first undervoltage state information if the first undervoltage state information is not undervoltage.

8. A display system, characterized in that, The display system includes: A controller, at least one driver connected to the controller, and at least one power supply; The driver is provided with at least two driving channels, and each driving channel is connected to the power supply through n LEDs connected in series, where n is an integer greater than zero; The controller is used to perform the backlight drive channel short circuit detection method as described in any one of claims 1 to 6.

9. An electronic device, characterized in that, The electronic device includes a processor, a memory, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the backlight drive channel short-circuit detection method as described in any one of claims 1 to 6.

10. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the backlight drive channel short-circuit detection method as described in any one of claims 1 to 6.

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